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Date: Fri, 20 Feb 2026 08:38:00 +0100
Message-ID: <CALXu0UeH03iz5_pc_OSMZs+xUJ_WzfBr+TGJQriBxWXUYYuESA@mail.gmail.com>
Subject: Re: Cygwin sparse file support: Please support fcntl(..., F_FREESP,
 ...)
To: cygwin AT cygwin DOT com
From: Cedric Blancher via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Cedric Blancher <cedric DOT blancher AT gmail DOT com>
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On Thu, 5 Feb 2026 at 15:34, Corinna Vinschen via Cygwin
<cygwin AT cygwin DOT com> wrote:
>
> On Feb  5 08:41, Cedric Blancher via Cygwin wrote:
> > On Thu, 5 Jun 2025 at 09:07, Cedric Blancher <cedric DOT blancher AT gmail DOT com> wrote:
> > >
> > > On Mon, 17 Feb 2025 at 11:07, Corinna Vinschen via Cygwin
> > > <cygwin AT cygwin DOT com> wrote:
> > > >
> > > > On Feb 16 16:27, Sebastian Feld via Cygwin wrote:
> > > > > On Sat, Feb 15, 2025 at 4:15 PM Cedric Blancher via Cygwin
> > > > > <cygwin AT cygwin DOT com> wrote:
> > > > > >
> > > > > > Good afternoon!
> > > > > >
> > > > > > Could Cygwin 3.6 please support fcntl(...,F_FREESP,...) and
> > > > > > cntl(...,F_FREESP64,...), as specified in
> > > > > > https://docs.oracle.com/cd/E19253-01/816-5167/fcntl-2/index.html
> > > > > >
> > > > > > Lots of older software from Solaris, SUPER/UX, CrayOS use F_FREESP for
> > > > >
> > > > > QNX and AIX support F_ALLOCSP and F_FREESP
> > > > >
> > > > > > punching a hole into a file, and IMO it'll be nice if this works for
> > > > > > Cygwin out of the box.
> > > > >
> > > > > +1
> > > > >
> > > > > Please also add F_ALLOCSP and F_ALLOCSP64 to allocate space in a file.
> > > > > Like F_FREESP and F_FREESP64 it takes a struct flock/flock64, so it's
> > > > > a pretty straightforward API.
> > > >
> > > > No, we won't do that. We're not adding any new feature to 3.6 this
> > > > close to the release.
> > >
> > > What about now? Could this be implemented for Cygwin 3.7, please?
> >
> > Hello?
>
> These are equivalent to the fallocate stuff.  Just add an #ifdef to
> the source.  You'll have to do that on Linux anyway.
>
> If you want this in Cygwin, please consider https://cygwin.com/acronyms/#PTC

I'll try my luck with making a patch

Ced
-- 
Cedric Blancher <cedric DOT blancher AT gmail DOT com>
[https://plus.google.com/u/0/+CedricBlancher/]
Institute Pasteur

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